Most likly the DC-DC converter board failing. Common (one of few) problem. Replacement available from Kenwood parts. Cheers, Dick -----Original Message----- From: kenwood-bounces at mailman.qth.net [mailto:kenwood-bounces at mailman.qth.net]On Behalf Of Mark Sent: Saturday, December 31, 2011 7:48 PM To: kenwood at mailman.qth.net Subject: [Kenwood] Kenwood TS-850 Importance: High Hello all! My name is Mark, W4TGB. I own a highly reliable TS-850 that has just developed a power output issue. At somewhat random times, when I key the transmitter in RTTY or other full carrier mode, the output power will go to full output and then drop off to nearly zero within about 3 seconds and then back to full power. In some cases, the rig will go to full power, drop to near zero and then back to full power followed by another drop to near zero and then to full power... repeat... Has anyone else seen this issue? Any thoughts on a repair? Thank you, Mark W4TGB ______________________________________________________________ Kenwood mailing list Home: http://mailman.qth.net/mailman/listinfo/kenwood Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Kenwood at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html